TPSMA12AHE3_A/I Equivalent & Substitute Parts

Part Overview

The TPSMA12AHE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AC (SMA) package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates across an automotive-grade temperature range with AEC-Q101 qualification and ROHS3 compliance.

Substiute Parts

TPSMA12AHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 915TPSMA12AHE3_A/I Datasheet

Current PartRFQ

P4SMA12A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 1167P4SMA12A-E3/61 Datasheet

DirectRFQ

TPSMA12AHE3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 804TPSMA12AHE3_B/I Datasheet

DirectRFQ

SMAJ12A-TR

STMicroelectronicsIn Stock: 17759SMAJ12A-TR Datasheet

MFR RecommendedRFQ

SMAJP4KE12A-TP

Micro Commercial CoIn Stock: 749SMAJP4KE12A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMA12AHE3_A/I is determined by strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters that define substitutability are:

• Voltage - Reverse Standoff (Typ): 10.2V
• Voltage - Breakdown (Min): 11.4V
• Voltage - Clamping (Max) @ Ipp: 16.7V
• Current - Peak Pulse (10/1000µs): 24A
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Substitute parts are grouped into two categories based on electrical parameter alignment:

Category 1 - Direct Electrical Equivalents: Parts that maintain identical voltage and current specifications (10.2V standoff, 16.7V clamp, 24A peak pulse).

Category 2 - Functional Alternatives: Parts with similar voltage ratings but different peak pulse current specifications, suitable for applications where the higher current rating provides additional margin.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - TPSMA12AHE3_B/I: This part is the direct successor to the obsolete TPSMA12AHE3_A/I, maintaining identical electrical specifications, automotive-grade classification, and AEC-Q101 qualification. The operating temperature range (-65°C ~ 185°C) matches the original part exactly. This substitute is the preferred choice for automotive applications requiring maintained qualification status and temperature performance.

Secondary Recommendation - P4SMA12A-E3/61: This Vishay part provides identical electrical parameters (10.2V standoff, 16.7V clamp, 24A peak pulse) and is actively produced. The operating temperature range is -65°C ~ 150°C, which is 35°C lower than the original part. This substitute is suitable for applications where the lower temperature ceiling is acceptable and automotive-grade qualification is not required.

Alternative Recommendation - SMAJP4KE12A-TP: This Micro Commercial Co part maintains the critical electrical specifications (10.2V standoff, 16.7V clamp) with a marginally higher peak pulse current of 24.6A. The operating temperature range (-55°C ~ 175°C) provides adequate coverage for most industrial applications. This option is suitable when automotive qualification is not mandatory.

Not Recommended - SMAJ12A-TR: While this STMicroelectronics part shares the same package and power rating, it exhibits different voltage characteristics (12V standoff, 25.3V clamp) and significantly higher peak pulse current (91A at 8/20µs). These electrical differences make it unsuitable as a direct substitute for the TPSMA12AHE3_A/I.

Frequently Asked Questions (FAQ)

Q: Can TPSMA12AHE3_B/I be used as a direct replacement for TPSMA12AHE3_A/I? A: Yes. Both parts are manufactured by Vishay, share identical electrical specifications, maintain automotive-grade classification with AEC-Q101 qualification, and operate across the same temperature range (-65°C ~ 185°C). The primary difference is product status: the original is obsolete while the _B/I variant is active production.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications? A: These represent different test pulse waveforms used to characterize peak pulse current. The TPSMA12AHE3_A/I uses the 10/1000µs waveform with 24A rating, while SMAJ12A-TR uses the 8/20µs waveform with 91A rating. These are not directly comparable specifications and indicate different application profiles.

Q: Is P4SMA12A-E3/61 suitable for automotive applications? A: P4SMA12A-E3/61 maintains identical electrical specifications and ROHS3 compliance but does not carry automotive-grade designation or AEC-Q101 qualification. It is suitable for general-purpose industrial applications but not recommended for automotive designs requiring qualification documentation.

Q: Why does SMAJ12A-TR have a higher clamping voltage (25.3V vs 16.7V)? A: SMAJ12A-TR is designed for a different voltage protection level. Its 12V standoff and 25.3V clamp characteristics indicate it is intended for higher voltage transient suppression applications. This makes it functionally incompatible with circuits designed for the 10.2V standoff / 16.7V clamp profile of the TPSMA12AHE3_A/I.

Q: Are all substitute parts available in the same DO-214AC (SMA) package? A: Yes. All listed substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and footprint compatibility with the original design.

Q: What is the impact of the lower operating temperature range in P4SMA12A-E3/61? A: P4SMA12A-E3/61 operates to 150°C maximum junction temperature, compared to 185°C for the original part. This 35°C difference may be significant in high-temperature environments or applications with limited thermal margin. Verify that your circuit's maximum junction temperature requirement does not exceed 150°C before selecting this substitute.